Chevrolet Equinox foul smell from vents when running AC on Chevrolet Equinox

Some Chevrolet Equinox owners report experiencing foul smells coming from the vents when running the AC, which can be attributed to several factors. A dirty AC filter is often cited as a common cause of unpleasant odors in the vehicle. Additionally, leaking coolant or refrigerant may produce a sweet smell, typically originating from the heater core. Some owners notice a musty odor, reminiscent of wet gym socks, which could indicate a problem with the cabin filter, even in low-mileage vehicles. A strong exhaust or gasoline-like smell may also occur when the fan is set to medium or high, especially when the AC is activated. Other reported sources of unpleasant odors include rotting leaves, dead animals, or plugged drains within the AC system. Furthermore, some owners detect rotten coolant-like smells, signaling potential underlying issues that require service attention. A sharp, indescribable smell upon initial AC startup might be due to clogged evaporator drains, leading to moisture buildup and strange odors. It is advisable for owners experiencing these issues to check and replace the AC filter, inspect for leaks, and consider servicing the vehicle to address any underlying problems.